In vitro evaluation of the efficacy of a veterinary dry heat fluid warmer

Vivian Chiang, Katrina Hopper, Matthew S. Mellema

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Objectives: To evaluate the efficacy of a veterinary dry heat fluid warmer on ambient and prewarmed crystalloid fluids and refrigerated packed red blood cells (pRBC). Design: Prospective in vitro study. Setting: University teaching hospital. Animals: None. Interventions: Ambient and prewarmed crystalloid fluids and refrigerated pRBC were delivered via a standard fluid administration set at various rates. A thermistor continuously monitored fluid outflow temperature with and without a dry heat veterinary fluid warmer (study device). Results: The outflow temperature was significantly higher with the study device as compared to control conditions for all fluids and rates tested. The maximum outflow temperature of approximately 35°C (95°F) occurred when the study device was applied to either ambient or prewarmed crystalloid fluids at 50 mL/h. In the study device trials, the outflow temperature of ambient crystalloid fluids ranged from 35.1° to 27.3°C (95.2° to 81.1°F) as the fluid rate increased from 50 to 999 mL/h. Control trials of prewarmed crystalloids produced outflow temperatures that rapidly approached ambient temperature. Addition of the study device to prewarmed crystalloids resulted in outflow temperatures that were similar to that of the corresponding ambient crystalloid trials. Control trials of refrigerated pRBC achieved ambient temperature at rates from 10 to 500 mL/h. With the study device, pRBC were maximally warmed to an outflow temperature of 35.8°C (96.4°F) at 100 mL/h. Conclusion: Although the study device generated statistically significant increases in outflow temperature of crystalloid fluids and pRBC, the ability of the device to decrease the metabolic cost of fluid administration is limited to specific clinical scenarios. The use of prewarmed crystalloid fluids with or without the study device offers minimal benefit over ambient temperature crystalloids. Substantial warming of pRBC occurs during administration, even without use of the study device.

Original languageEnglish (US)
Pages (from-to)639-647
Number of pages9
JournalJournal of Veterinary Emergency and Critical Care
Volume21
Issue number6
DOIs
StatePublished - Dec 2011

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Hot Temperature
heat
Temperature
Equipment and Supplies
Erythrocytes
erythrocytes
ambient temperature
temperature
In Vitro Techniques
fluids
crystalloid solutions
Teaching Hospitals
in vitro studies
Costs and Cost Analysis

Keywords

  • Crystalloid
  • Fluid therapy
  • Hypothermia
  • Resuscitation
  • Thermoregulation

ASJC Scopus subject areas

  • veterinary(all)
  • Medicine(all)

Cite this

In vitro evaluation of the efficacy of a veterinary dry heat fluid warmer. / Chiang, Vivian; Hopper, Katrina; Mellema, Matthew S.

In: Journal of Veterinary Emergency and Critical Care, Vol. 21, No. 6, 12.2011, p. 639-647.

Research output: Contribution to journalArticle

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abstract = "Objectives: To evaluate the efficacy of a veterinary dry heat fluid warmer on ambient and prewarmed crystalloid fluids and refrigerated packed red blood cells (pRBC). Design: Prospective in vitro study. Setting: University teaching hospital. Animals: None. Interventions: Ambient and prewarmed crystalloid fluids and refrigerated pRBC were delivered via a standard fluid administration set at various rates. A thermistor continuously monitored fluid outflow temperature with and without a dry heat veterinary fluid warmer (study device). Results: The outflow temperature was significantly higher with the study device as compared to control conditions for all fluids and rates tested. The maximum outflow temperature of approximately 35°C (95°F) occurred when the study device was applied to either ambient or prewarmed crystalloid fluids at 50 mL/h. In the study device trials, the outflow temperature of ambient crystalloid fluids ranged from 35.1° to 27.3°C (95.2° to 81.1°F) as the fluid rate increased from 50 to 999 mL/h. Control trials of prewarmed crystalloids produced outflow temperatures that rapidly approached ambient temperature. Addition of the study device to prewarmed crystalloids resulted in outflow temperatures that were similar to that of the corresponding ambient crystalloid trials. Control trials of refrigerated pRBC achieved ambient temperature at rates from 10 to 500 mL/h. With the study device, pRBC were maximally warmed to an outflow temperature of 35.8°C (96.4°F) at 100 mL/h. Conclusion: Although the study device generated statistically significant increases in outflow temperature of crystalloid fluids and pRBC, the ability of the device to decrease the metabolic cost of fluid administration is limited to specific clinical scenarios. The use of prewarmed crystalloid fluids with or without the study device offers minimal benefit over ambient temperature crystalloids. Substantial warming of pRBC occurs during administration, even without use of the study device.",
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